One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,16)(13,17)(14,18)(19,22)(20,23)(21,24)(25,26,30,33)(27,35,37,50)(28,39,41,32)(29,43,45,34)(31,44,47,38)(36,52,40,51)(42,49,56,54)(46,53,48,55)(9,11,14,21)(10,15,18,24)(12,20,13,19)(16,23,17,22)(25,27,30,37)(26,31,33,47)(28,40,41,36)(29,44,45,38)(32,48,39,46)(34,50,43,35)(42,53,56,55)(49,51,54,52)(2,5)(6,8)(9,12,14,13)(10,16,18,17)(11,19,21,20)(15,22,24,23)(25,28,30,41)(26,32,33,39)(27,36,37,40)(29,42,45,56)(31,46,47,48)(34,49,43,54)(35,51,50,52)(38,53,44,55)(9,13,14,12)(10,17,18,16)(11,20,21,19)(15,23,24,22)(27,37)(31,47)(35,50)(36,40)(38,44)(46,48)(51,52)(53,55)(1,3,4,7)(2,6,5,8)(10,18)(15,24)(16,17)(22,23)(26,33)(28,41)(31,47)(34,43)(35,50)(36,40)(42,56)(53,55)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.